Filcoflex Case Study Explosiegevaar Final · Product: Degree of risk Required category for the...
Transcript of Filcoflex Case Study Explosiegevaar Final · Product: Degree of risk Required category for the...
EU 10/2011 EG 1935/2004CERTIFIED
Dust Dust explosion constant Examples
ST 0 Kst = 0 Cement, chalk, sand, ash, aerosol, salts
ST 1 0 < Kst ≤200 Flour, malt dust, many corn starches, sugar dust, many wood types, sulphur, coal dust, PVC dust, carbon black
ST 2 201 < Kst ≤300 A single corn starch type, beech wood dust, epoxy resin, methyl cellulose, paraformaldehyde, some pigments, some powder aromas and vitamins
ST 3 Kst > 301 Aluminium, magnesium, red phosphorus, Anthraquinone
EU 10/2011 EG 1935/2004CERTIFIED
Product:Degree of risk Required category for the device
Gas/Vapour Dust
Zone 0 Zone 20 Where there is a continuous, long-lasting or frequently occurring explosive environment Category 1
Zone 1 Zone 21 Where an explosive environment is likely to occur Category 2
Zone 2 Zone 22 Where an explosive environment is unlikely to occur, and if so, only rarely and for a short time Category 3
Symbol Meaning
B Management of ignition sources
BZ Fire number
c Safe construction
d Explosion hazard
dp/dtmax Maximum rate of pressure rise
e Increased safety
Emin Minimal ignition energy
fr Restricted breathing enclosure
i Intrinsic safety
k Protection by immersion
Kg Gas explosion constant
Kst Dust explosion constant
LEL Below explosion limits
m Embedded material
mD Cast
MIE Minimal ignition energy
MOT Minimum cloud ignition temperature
n Non-sparking material
o Immersion in oil
p Overpressure protection
Pmax Maximum explosion pressure
q Powdered fi lling
St 0 t/m 3 Dust classifi cation
T1 t/m 6 Temperature class
tD Protection by enclosure
TglimMinimum ignition temperature of the dust layer
TminMinimum ignition temperature of the cl-oud
UEL Above explosion limit
Ignition source
1. Hot surfaces
2. Falames and hot gases (including hot particles)
3. Mechanically generated sparks
4. Electrical apparatus
5. Stray electrical currents, cathodic corrosion protection
6. Static electricity
7. Lightning
8. Radio frequency (RF) electromagnetic wavees from 104 Hz to 3 x 1012 Hz
9. Electromagnetic waves from 3 x 1011 Hz to 3 x 1015 Hz
10. Ionising radiation
11. Ultrasonics
12. Adiabatic compression and shock waves
13. Chemical reactions, including self-ignition of dusts
EU 10/2011 EG 1935/2004CERTIFIED